Elegant 2004 Subaru Wrx Horsepower Photos 2004 subaru wrx horsepower one year test update 2004 subaru impreza wrx sti our subaru wrx sti is piling on the miles almost as quickly as the tachometer screams to redline under boost the logbook is filled with compliments about the torquey power delivery from the 2004 subaru wrx horsepower